Go for a rideA bicycle tour of Washington County. Cue sheets, snacks and lunch will be provided for 25-, 63-, and 103-mile marked routes. Helmets are required and minors must be registered by a parent or guardian. 7 a.m. to 5 p.m. Saturday, Aug. 11. Starts and ends at San Mar Children’s Home, Mapleville Road, Boonsboro. Registration is $40. Proceeds benefit San Mar Children’s Home. To register, go to www.bikecvcc.com or call 301-797-1235 for information. Riders can also sign up the day of the event.

Meteor shower partiesAt Fort Frederick State Park, a naturalist will discuss the Perseid meteor shower and lead a meteor-watching party. If it rains or is cloudy the program will be canceled. 8:30 p.m. Saturday, Aug. 11, at the park at 11100 Fort Frederick Road, Big Pool. Meet at the nature center. Free. Call 301-842-2155.The Potomac Valley Audubon Society will host a meteor-watching party at Trinity United Methodist Church’s Orchard House at Trinity Center, 4599 Shepherdstown Road, between Martinsburg, W.Va., and Shepherdstown, W.Va. 2 to 6 a.m. Sunday, Aug. 12. The event will not be held if the sky is fully obscured by clouds. Call 304-676-8739 or email ellen@potomacaudubon.org.